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yousefipanah

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Trying to send e-mails to this domain I receive this error. All the others work fine.
Is it something that should interest the recipient server or I'm missing something in the configuration of my smtp?
Thanks in advance to who can help me.


This is an informative message sent by KerioConnect.

The server was not able to deliver your email message

Subject: test
Date: Sun, 24 Sep 2017 17:39:53 +0330



to the following addresses:

<*****<_at_>efarda.ir> (mail.efarda.ir: 550 Access denied - Invalid HELO name (
See RFC2821 4.1.1.1))
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Backspin

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Maybe you have set an incorrect hostname (Configuration->Domains->Internet hostname).
A domain name does not qualify as a hostname, so if you have something like 'mydomain.com' as hostname, it will not work with receiving servers which check the hostname. You have to set someting like 'myserver.mydomain.com'.

[Updated on: Mon, 25 September 2017 13:33]

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clan

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Backspin wrote on Mon, 25 September 2017 09:10
Maybe you have set an incorrect hostname (Configuration->Domains->Internet hostname).
A domain name does not qualify as a hostname, so if you have something like 'mydomain.com' as hostname, it will not work with receiving servers which check the hostname. You have to set someting like 'myserver.mydomain.com'.

You may be right pointing to the setting for the internet hostname, but it does not need to be a subdomain, a fully qualified domain is sufficient. It helps with some servers if the domain resolves to the IP address of the server making the connection, and if there is a PTR record resolving the IP address back to the hostname.
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